define('components/zepto/touch', function(require, exports, module) {

  var Zepto = require('components/zepto/zepto');
  //     Zepto.js
  //     (c) 2010-2014 Thomas Fuchs
  //     Zepto.js may be freely distributed under the MIT license.
  
  ;(function($){
    var touch = {},
      touchTimeout, tapTimeout, swipeTimeout, longTapTimeout,
      longTapDelay = 750,
      gesture
  
    function swipeDirection(x1, x2, y1, y2) {
      return Math.abs(x1 - x2) >=
        Math.abs(y1 - y2) ? (x1 - x2 > 0 ? 'Left' : 'Right') : (y1 - y2 > 0 ? 'Up' : 'Down')
    }
  
    function longTap() {
      longTapTimeout = null
      if (touch.last) {
        touch.el.trigger('longTap')
        touch = {}
      }
    }
  
    function cancelLongTap() {
      if (longTapTimeout) clearTimeout(longTapTimeout)
      longTapTimeout = null
    }
  
    function cancelAll() {
      if (touchTimeout) clearTimeout(touchTimeout)
      if (tapTimeout) clearTimeout(tapTimeout)
      if (swipeTimeout) clearTimeout(swipeTimeout)
      if (longTapTimeout) clearTimeout(longTapTimeout)
      touchTimeout = tapTimeout = swipeTimeout = longTapTimeout = null
      touch = {}
    }
  
    function isPrimaryTouch(event){
      return (event.pointerType == 'touch' ||
        event.pointerType == event.MSPOINTER_TYPE_TOUCH)
        && event.isPrimary
    }
  
    function isPointerEventType(e, type){
      return (e.type == 'pointer'+type ||
        e.type.toLowerCase() == 'mspointer'+type)
    }
  
    $(document).ready(function(){
      var now, delta, deltaX = 0, deltaY = 0, firstTouch, _isPointerType
  
      if ('MSGesture' in window) {
        gesture = new MSGesture()
        gesture.target = document.body
      }
  
      $(document)
        .bind('MSGestureEnd', function(e){
          var swipeDirectionFromVelocity =
            e.velocityX > 1 ? 'Right' : e.velocityX < -1 ? 'Left' : e.velocityY > 1 ? 'Down' : e.velocityY < -1 ? 'Up' : null;
          if (swipeDirectionFromVelocity) {
            touch.el.trigger('swipe')
            touch.el.trigger('swipe'+ swipeDirectionFromVelocity)
          }
        })
        .on('touchstart MSPointerDown pointerdown', function(e){
          if((_isPointerType = isPointerEventType(e, 'down')) &&
            !isPrimaryTouch(e)) return
          firstTouch = _isPointerType ? e : e.touches[0]
          if (e.touches && e.touches.length === 1 && touch.x2) {
            // Clear out touch movement data if we have it sticking around
            // This can occur if touchcancel doesn't fire due to preventDefault, etc.
            touch.x2 = undefined
            touch.y2 = undefined
          }
          now = Date.now()
          delta = now - (touch.last || now)
          touch.el = $('tagName' in firstTouch.target ?
            firstTouch.target : firstTouch.target.parentNode)
          touchTimeout && clearTimeout(touchTimeout)
          touch.x1 = firstTouch.pageX
          touch.y1 = firstTouch.pageY
          if (delta > 0 && delta <= 250) touch.isDoubleTap = true
          touch.last = now
          longTapTimeout = setTimeout(longTap, longTapDelay)
          // adds the current touch contact for IE gesture recognition
          if (gesture && _isPointerType) gesture.addPointer(e.pointerId);
        })
        .on('touchmove MSPointerMove pointermove', function(e){
          if((_isPointerType = isPointerEventType(e, 'move')) &&
            !isPrimaryTouch(e)) return
          firstTouch = _isPointerType ? e : e.touches[0]
          cancelLongTap()
          touch.x2 = firstTouch.pageX
          touch.y2 = firstTouch.pageY
  
          deltaX += Math.abs(touch.x1 - touch.x2)
          deltaY += Math.abs(touch.y1 - touch.y2)
        })
        .on('touchend MSPointerUp pointerup', function(e){
          if((_isPointerType = isPointerEventType(e, 'up')) &&
            !isPrimaryTouch(e)) return
          cancelLongTap()
  
          // swipe
          if ((touch.x2 && Math.abs(touch.x1 - touch.x2) > 30) ||
              (touch.y2 && Math.abs(touch.y1 - touch.y2) > 30))
  
            swipeTimeout = setTimeout(function() {
              touch.el.trigger('swipe')
              touch.el.trigger('swipe' + (swipeDirection(touch.x1, touch.x2, touch.y1, touch.y2)))
              touch = {}
            }, 0)
  
          // normal tap
          else if ('last' in touch)
            // don't fire tap when delta position changed by more than 30 pixels,
            // for instance when moving to a point and back to origin
            if (deltaX < 30 && deltaY < 30) {
              // delay by one tick so we can cancel the 'tap' event if 'scroll' fires
              // ('tap' fires before 'scroll')
              tapTimeout = setTimeout(function() {
  
                // trigger universal 'tap' with the option to cancelTouch()
                // (cancelTouch cancels processing of single vs double taps for faster 'tap' response)
                var event = $.Event('tap')
                event.cancelTouch = cancelAll
                touch.el.trigger(event)
  
                // trigger double tap immediately
                if (touch.isDoubleTap) {
                  if (touch.el) touch.el.trigger('doubleTap')
                  touch = {}
                }
  
                // trigger single tap after 250ms of inactivity
                else {
                  touchTimeout = setTimeout(function(){
                    touchTimeout = null
                    if (touch.el) touch.el.trigger('singleTap')
                    touch = {}
                  }, 250)
                }
              }, 0)
            } else {
              touch = {}
            }
            deltaX = deltaY = 0
  
        })
        // when the browser window loses focus,
        // for example when a modal dialog is shown,
        // cancel all ongoing events
        .on('touchcancel MSPointerCancel pointercancel', cancelAll)
  
      // scrolling the window indicates intention of the user
      // to scroll, not tap or swipe, so cancel all ongoing events
      $(window).on('scroll', cancelAll)
    })
  
    ;['swipe', 'swipeLeft', 'swipeRight', 'swipeUp', 'swipeDown',
      'doubleTap', 'tap', 'singleTap', 'longTap'].forEach(function(eventName){
      $.fn[eventName] = function(callback){ return this.on(eventName, callback) }
    })
  })(Zepto)
  
  module.exports = Zepto;
  

});
